Wedge grip scraper blade



Dec. 11, 1945. v H, WON 2,390,611

wEDGE GRIP SCRAPR BLADE Filed May 17, v1944 2 shets-sh'eeul INV ENTOR.

)TTOPNEK 1 Patented Dec. 114, 1,945

UNITED STATES PATENT OFFICE invention relates to scrapers of the dragd1' pull type that are usually employed in the collection andtransportation of heavy materials such gravel, comminutecl minerals,ore, coal and other substances, 'mined from subterranean cavities of anopen or closed Character.

One of the important objects of this invention is the provision of ascraper of the pull or drag' typ, having as a component part thereof, areplaceable, intercnangeable'and quickly attachable blade that isassociated with the lback member of the scraperand which has unique andnovel struct'uif at the. Zone of juncture with the said back member, to'insure an ever tightening grip as the scraper is normally used.

A still further aim of this invention is the provision of a heavy dutyscraper having a sectional blade, the parts whereof may be interchangedto allow equalizing the wear thereon and to theref fore, assure extendedlife of the blade as a unit.

Other objects of this invention include the unique and novel form ofinterengaging elements f the scraper back member and scraper blade,Which elements in their preferred embodiment, assume the character of alongitudinal groove, wedge-shaped in cross section, formed in the blade,a wedge-shaped marginal edge on the back member of the scraper, anduniquely disposed bolts designed and located to draw the inclined facesof the wedge-shaped portions of the back member and blade intoprogressively tighter engagement as the bolts are positioned.

Other objects of the invention will appear during the course of thefollowing specication, referring to the accompanying drawings, wherein:

Fig. 1 is a top plan View of a scraper having a blade made in accordancewith the present ini vention.

Fig. 2 is a side elevational View of the same.

Fig. 3 is a rear elevational View of the scraper.

Fig. 4 is a fragmentary cross sectional view taken on line IV-IV of Fig.3.

l Fig. 5 is a similar sectional View taken on line V-V oflig. 3.

Fig. 6 is a perspective fragmentary detailed stretch-out View of aportion of the marginal edge of the back member of the scraper and aportion of the blade showing these parts in a separated condition; and

Fig.v 7 is a similar perspective sectional fragmentary stretch-out viewof the zone of connection between the marginal edge of the back memberof the scraper and the blade thereof.

'I'he hereinafter described blade may be applied to any type scraper,but the heavy duty model illustrated is'most advantageously equippedwitha removable blade, and therefore, it will be understood that the`hereinaiter described features embodied in the blade and disposed atthe zone of attachment thereof, may be employed re-` gardle'ss of thesp'ecc form of the sc'nap'e'r.

Like reference characters refer' to' similar parte and the numeral l0generally designates a scraper adapted for attachment to a tractor orthe like, not here Showni Any means of pulling the scraper may besecured tothe hitch I2.

The back member I4 is arcuate in transverse cross' section and usuallyassumes the positionwith respect to the horizontal,` illustrated inFigs. 2, 4 and 5'.` Reinforcing` ribs I6 diverge from aY point ofconnection with hitch I2 and terminate `near themarginaledge' of backmember I4. Back member I4 terminates in a marginal edge i8 that iswedge-shaped in cross section. The faces 2U and 22 of this marginal edgemerge at the free end of back member I4 and the innermost portion offace 20 terminates at a shoulder 24, the purpose whereof is presently tobe set down.

The wedge-shaped marginal edge I8 of back member I4 is provided with anumber of openings 26 and 28 specially disposed as regards theirlongitudinal axes and for the reception of bolts 30 and 32 respectively.Openings 26 are provided through marginal edge I8 and have their axessubstantially perpendicular to the plane of face 2U. .Openings 28 areformed through the marginal edge I 8 and are inclined with respect tothe major plane of Wedge-shaped marginal edge I8 and the blade sections40. Openings 28 each communicate with a cavity 36 formed. in the backmember I4.

The blade in its entirety is designated by the numeral 38. The sections40 thereof, `are two in number, as illustrated in Figs. 1 and 3. Alarger number of sections may be employed but where the blade 38 issectional, the spacing of the openings 26 and 28 in back member I4should correspond so that interchanging of sections 40 may occur.

Each section 4I) is identical in character in that it is a wedge-shapedbody in transverse cross section, having a longitudinal groove 42 thatis likewise wedge-shaped in transverse cross section. 'Ihe angle ofinclination of the sides of groove 42 formed in blade sections 40, isthe same as the angularity of faces 20 and 22 of marginal edges I8.Holes 44and 45 through the bifurcated part of blade section 3U, receivethe bolts 30 and 32, as illustrated in Fig. 5.

v A boss 48 on the lead surface of blade sections 40, cooperates withholes 44 and 46 in providing a shoulder for the head of bolt 32 and acavity for the reception of nut 50 in screw-threaded engagement withbolt 30. Cavity 36 accommodates nut 52 and an access opening 54 in onewall of the bifurcated portion of section 4|] permits the operator toreach and tighten nut 52.

The inner edge of one of the walls of the bifurcated portion of scrapersection 40, engages shoulder 24 when the parts are assembledasilylustrated: When the bolt and nut 32 and 52. re-

spectively, are tightened, blade section 40 is pulled inwardly totightly wedge together the specially contoured marginal edge of backmember I4 and similarly contoured groove 42 in blade section 40. Thisaction on the part of the interconnecting means is augmented andcontinuously supplemented by the normal operation of the scraper-f thatis when the scraper is pulled, blade sections 40 are forced into tighterengagement with back member I4 and no tendency to exert strain uponbolts 30 and 32 is presented. The presence of the blade sections -40that extend the fulllength of the free marginal edge of back member I4,protects the said marginal edge thereof and when new blade sections arerequired, the protected surface will always receive the replaced blades.

It is important that bolts 30 and 32 be disposed with respect to eachother and their interconnected parts, as illustrated in Fig. 5 and abovedefined.

Modifications and changes in specific form of the parts may be made solong as the same are not changed to prevent enjoying one of the objectsof the invention, i. e., the ability to interchange sections 40 of blade38. It is known that the outer portions of each blade section 40 willwear to a greater degree than the edge throughout the remaining portionof the length of each section. When wear has occurred to such an extentthat material Will escape beneath the worn edges, sections 4l] areinterchanged to cause the free edges of sections to assume and maintainrectilinear form. The spacing of the sevy eral bolts which form themeans for securing the yblade sections in place, is the same to eachside of a vertical medial line of the back member.

. Having thus describedthe invention,what is claimed as new and desiredto be secured by Letters Patent isz' 1. In a scraper of the characterdescribed, a back member having a marginal portion, wedgeshaped intransverse cross section, along one edge thereof said marginal portionhaving a series of spaced cavities formed therein with openings incommunication therewith and extending to the outer faces of the marginalportion, said openings having their longitudinal axes at angles to eachother; a blade provided with a longitudinal wedge-shaped groove alongone edge thereof for receiving the said wedge-shaped marginal edge ofthe back member, said blade having holes formed therein in register withthe openings in the back member; and bolts in the openingsand holes,whereby certain of said bolts are disposed at an angle to exerttransverse pressure on the blade to force the wedge-shaped marginalportion of the back member into the said groove of the blade when thebolts are tightened.

2. A scraper of the character set forth in claim l wherein the boltshave heads on one end and nuts on the opposite ends, and said bodymember and blade have the openings and holes respectively therein formedto receive said heads and the said nuts.

' VIRGIL H. NIXON.

